:root {
    --bg-color: #f0f0f0;
    --text-color: #000;
    --container-bg: transparent;
    --btn-bg: #4CAF50;
    --btn-text: white;
}

body.dark-mode {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --container-bg: #1e1e1e;
}

body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.container {
    text-align: center;
    padding: 20px;
    background-color: var(--container-bg);
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

#theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 8px 16px;
    cursor: pointer;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    transition: transform 0.2s;
}

#theme-toggle:hover {
    transform: scale(1.05);
}

#generator-btn {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    margin-bottom: 20px;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    border-radius: 4px;
}

#numbers-container {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.number-circle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: #4CAF50;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
}